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Catalina/Capri 25/250 Sailor's Forums

Catalina 25 Specific Forum

fairing the rudder

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teamwike
1st Mate

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82 Posts

Initially Posted - 02/18/2002 : 18:29:19

Looking for some information on how to fair the rudder. I understand the concept, but don't know the specifics. I am replacing the pintles and gudgeons, so while I have it off, I should make sure it is reasonably fair. The rudder has a bad vibration wh

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Dave Seely
1st Mate

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46 Posts

Response Posted - 02/18/2002 : 20:18:10

Mine vibrates badly too but I always assumed it had something to do with the nasty split on the leading edge of the rudder. Splitting is fairly common on rudders manufactured in halves like the catalina rudders are. From looking at the split I can see tha

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Leon Sisson
Master Marine Consultant

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USA
1893 Posts

Response Posted - 02/18/2002 : 20:50:56

Max,

Oops, Dave Seely beat me to it. Yeah, what he said.<img src=icon_smile.gif border=0 align=middle>

There's a free computer program floating around the Net that generates the NACA offsets for you, given the fore and aft length of your rudder b

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Ken Cave
Navigator

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USA
148 Posts

Response Posted - 02/18/2002 : 23:13:13

Do you have the original rudder on your boat-or the newer modified one made by Catalina Yachts for a much improved replacement.

If you have the original one, you might opt for a replacement as the the new ones are awsome when it comes to steer the boat

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Bristle
Admiral

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USA
834 Posts

Response Posted - 02/18/2002 : 23:33:51

<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
No flutter, no chatter, no using two hands in trying to hold the boat together in a down wind. It does the work for you!

One of the best

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 02/19/2002 : 00:04:01

I recently purchased a Cat 25 with, what I believe to be, the second generation rudder. Anyway this rudder has the much talked about split occuring. It isn't that bad right now and I was wondering if I could just fill the crack with epoxy and use the rudd

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OJ
Master Marine Consultant

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USA
4382 Posts

Response Posted - 02/19/2002 : 09:33:38

I have the new style rudder on my "when necessary" list. If the immediately above post is accurate, I will have serious reservations <img src=icon_smile_shock.gif border=0 align=middle> about investing in the new style rudder if it too develops the infa

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Bristle
Admiral

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USA
834 Posts

Response Posted - 02/19/2002 : 15:22:25

<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
I recently purchased a Cat 25 with, what I believe to be, the second generation rudder. Anyway this rudder has the much talked about split oc

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 02/19/2002 : 17:52:04

Yes, my rudder is of the newer design and, yes it is showing signs of splitting. I have it in the garage and sometime this week I'm going to repair it.

Don & Jennifer, Northstar
C25 SR/FK

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Derek Crawford
Master Marine Consultant

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USA
3323 Posts

Response Posted - 02/19/2002 : 20:23:33

I've had the new style rudder on "This Side Up" (yes! power steering!!) for at least 6 years - no signs of splitting (yet)
Derek

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Gary B.
Admiral

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USA
969 Posts

Response Posted - 02/19/2002 : 21:54:49

OK, here's the dumb question....can someone explain (W/O getting TOO technical) how the new balanced rudder is an improvement? My understanding of sailing suggests that, when all other forces are balanced, very little rudder is needed. Don't I run the r

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teamwike
1st Mate

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82 Posts

Response Posted - 02/19/2002 : 22:18:57

Thanks for all the advice and technical information. I have already allocated my son's college saving for this year on running rigging and sails, so the new rudder will have to wait this year. I will fix the small dings and paint her up for another seaso

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Derek Crawford
Master Marine Consultant

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USA
3323 Posts

Response Posted - 02/19/2002 : 23:19:43

Gary B. - I'm probably one of the least technical guys on this forum - I invented the KISS principle <img src=icon_smile_big.gif border=0 align=middle>! It would seem to me that with some rudder area AHEAD of the pivot point, the pressure (that was wholly

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Bristle
Admiral

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USA
834 Posts

Response Posted - 02/19/2002 : 23:22:41

Gary:

The balance isn't from a larger blade, although I haven't calculated the areas... The balance is from having a small part of the blade forward of the pivot line through the pintles. This balances the forces on the tiller--not the whole boat. I

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Derek Crawford
Master Marine Consultant

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USA
3323 Posts

Response Posted - 02/19/2002 : 23:28:40

Max - "The rudder has a bad vibration whenever boat speed gets over 5+ Knots"
Do you have a smaller vibration at lower speeds too? Often a dirty bottom (on the boat <img src=icon_smile.gif border=0 align=middle>) will cause this because of the t

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teamwike
1st Mate

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82 Posts

Response Posted - 02/21/2002 : 10:05:30

Derek, I haven't check the boat bottom myself, but I had it cleaned the first of this month and the diver reported all looked good( asked him to look for anything that might cause turbulence over the rudder). I replace the pintles and gudgeons( new from C

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FrankV
Navigator

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USA
135 Posts

Response Posted - 02/21/2002 : 21:05:20

We replaced our old rudder with the new one and have a slight vibration now when going slow. We are guessing it is turbulence from the skeg or keel hitting the front of the rudder and being amplified by the rudder design. Past two knots and it goes away.

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Bristle
Admiral

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USA
834 Posts

Response Posted - 02/22/2002 : 10:40:18

<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
We replaced our old rudder with the new one and have a slight vibration now when going slow. We are guessing it is turbulence from the skeg o

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FrankV
Navigator

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USA
135 Posts

Response Posted - 02/22/2002 : 14:14:17

New gudgeons, new pintles, definite frustration over going slow. I just did not the boat shook when it wants to go faster! Maybe it is telling me to buy the new main so it can power up!

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